瀏覽

Advantex AVM4

位置：<2><16><01>

High output power

Wide I/Q bandwidth

Precise output level control

Output filtering

Adjustment of LO suppression

Small size

Low cost

Advantex AVM4 100 MHz - 4 GHz Quadrature Modulator is is designed to
generate a modulated signal at the carrier frequency. It can be applied
in testing and debugging of digital communication receivers, as well as
for digital modulators which form complex I/Q-signal for later transfer
to the carrier frequency.

Figure 1 shows the block diagram of quadrature modulator, the main
block
of the instrument. Signal from the LO input is fed to the phase-shifter,
one output of which is shifted by +45° and multiplied by the signal
from the I input, the other shifted by −45°, – multiplied from the Q
input. Then these signals are added and fed to the filter block, which
suppress the LO products, i.e. 2fLO, 3fLO, etc. The resulting signal is fed to the APC (Automatic Power Control) block, then – to the RF Out output.

The instrument has USB and RS-232 interfaces for SCPI remote control and firmware updating capability.